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Description:
A “simple” double frame rail is 2 diagonal bars that attache to the “lower horizontal cage support” bar (SFI bar #15) at/around the top of the 4-link brackets. It then runs diagonally down & attaches to the main frame rail somewhere at/around the trans crossmember to mid plate area. It forms a very large load carring triangle.
A “full” double frame rail is 2 main upper bars that tie the top of the 4-link bracket area (SFI bar #15) directly to the mid/upper area of the mid plate support tree bars. Then a number of secondary upright & diagonal bars tie the 2 main upper bars to the main frame rails. The finished “full” double frame rail looks like a Top Fuel chassis sitting inside a door car chassis. A full double frame rail might stop at the mid plate tree, or it might continue forward to the front of the car.
Tri-pod mounted struts must have the full double frame rail assembly running 4-link to the front because there is no bars running from the struts to the windshield bars..